For Béchamel sauce: Melt butter over medium heat in a large sauce pan. Add in all-purpose flour and let simmer until golden. Slowly whisk in milk and let it simmer until thick roux (about 10-20 minutes). Add a pinch of salt and nutmeg, stir for 1 minute, and remove sauce from heat.

Remove your CAULIPOWER crust from the box and the plastic wrapping, and place on a clean surface.